Strongly enhanced second-harmonic generation is observed from a two-dimensional square lattice GaAs/AlGaAs photonic crystal waveguide when the fundamental beam, the second-harmonic beam, or both beams resonantly couple to a leaky eigenmode. P -polarized second-harmonic spectra are obtained for s -polarized, 150-fs pump pulses that are tuned from 5000 to 5600 cm<sup>-1</sup> and directed along the Γ–<i>X</i> direction of the crystal for various angles of incidence. Compared with off-resonant conditions, enhancements of >1200× in the second-harmonic conversion are observed for resonant coupling of both the fundamental and the second-harmonic fields to leaky eigenmodes. The angular and spectral positions of the peaks are in good agreement with simulations.
© 2003 Optical Society of America
(190.2620) Nonlinear optics : Harmonic generation and mixing
(190.4390) Nonlinear optics : Nonlinear optics, integrated optics
(190.5970) Nonlinear optics : Semiconductor nonlinear optics including MQW
(230.7400) Optical devices : Waveguides, slab
J. P. Mondia, H. M. van Driel, W. Jiang, A. R. Cowan, and Jeff F. Young, "Enhanced second-harmonic generation from planar photonic crystals," Opt. Lett. 28, 2500-2502 (2003)